Lamp eyes

Just a curious question.
watching my fish swim around this morning and noticed that 1 of my lamp eyes if very different from the other.

All in the tank apart from one have very long fins with some really nice colouring around the edges then there is 1 with little fins and very plain as well as being a little bigger than the others that are very torpedo shape.
Don’t know if this is a gender thing or just an odd fish

pictures are hard to get as they love to be moving constantly

the smaller slimmer more colourful ones are the males.
the bigger fatter one with no colour is the female.

Colin_T said:

the smaller slimmer more colourful ones are the males.
the bigger fatter one with no colour is the female.

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I thought that might have been the case but wanted to check.
what would be the correct ratio for them?
may them moment I have 4 males 1 female

even numbers of males and females, or more females than males.